Abstract: The invention concerns a method for producing a cyclic L-amino acid of formula (I), characterised in that it consists in reacting a L-diamino acid of formula (II) or an enantiomeric mixture comprising such a L-diamino acid and a corresponding D-diamino acid in variable proportions, in the presence of an ornithine cyclodeaminase or a polypeptide homologous to the ornithine cyclodeaminase.

Abstract: In an exhaust gas turbine for a turbocharger of an internal combustion engine, including a housing with an inlet passage for conducting exhaust gas onto a turbine wheel supported in the housing, a guide vane structure movable into, and out of, an annular space of the inlet passage around the turbine wheel, an operating mechanism for moving the guide vane structure is provided which includes a cylinder, a ring provided with axial passages disposed around an inner sleeve, the guide vane structure being connected to one end of claws movably disposed in the axial passages and at least one of the claws being connected at its other end to the operating mechanism.

Abstract: In an exhaust gas turbine for a turbocharger of an internal combustion engine with a casing and a rotor rotatably supported in the casing, the casing includes an inlet duct with a guide vane structure supported so as to be movable into and out of a flow inlet area to the rotor by means of an electric motor.

Abstract: An exhaust-gas turbine for a turbocharger includes a rotor mounted rotatably in a turbine casing having a spiral inlet duct which is followed by an annular space surrounding the rotor. A guide-blade cascade is capable of being pushed axially into the annular space near the outer circumference of the rotor. The guide-blade cascade includes guide blades, is guided in an annular gap between an inner part and the turbine casing and is axially displaceable via an axial slide by a sliding sleeve. The guide-blade cascade with the axial slide, the inner part and/or the sliding sleeve are produced from an austenitic cast steel material having the following components: C≦0.2%; Si 1.5-2.5%; Mn≦2.00%; P≦0.045%; S≦0.03%; Cr 24.0-26.0%; Ni 19-22%; and W≦5%.

Abstract: In an exhaust turbine for a turbocharger having a rotor rotatably supported in a turbine casing wherein the turbine casing has a spiral inlet with an annular space disposed directly around the rotor and an axial cavity extending from the annular space axially into the casing and slideably receiving a guide vane structure so as to be movable between a retracted position in the annular space and an extended position, in which the guide vane structure is disposed in the annular space, the guide vane structure has opposite outer and inner cover rings and the turbine casing has a recess opposite the axial cavity so that in the extended position of the guide vane structure its outer cover ring is fittingly received in the recess while the inner cover ring is disposed at the outer end of the axial cavity providing for a smooth inlet flow duct surface.